Gems Sensors & Controls RFO, RFA Operating Manual

RFO/RFA-2500 Series Continuous Output

RotorFlow® Sensors

RotorFlow units monitor dynamic fluid flow. The rotor reacts to
turbulence, pulsation, entrained air, and other flow anomalies
induced in the flow stream by other process hardware. For
optimum performance, install RotorFlow units where nominal
flow conditions exist, with ports located at the top. Incoming
flow may be placed to either port. A minimum of 8" of straight
pipe on the inlet side is recommended.
(RFO) and voltage output (RFA) are determined by the velocity
of the monitored fluid acting on the sensor rotor. Input piping
with an orifice smaller than that of the sensor input will affect
sensor output.

Note:

Frequency output

Instruction Bulletin No.
157258
Rev. J

Low Flow Applications

A low flow adapter is supplied with all RotorFlow units. It is used to produce accurate response at low flow
rates. Fit the adapter as shown above, in the port selected for incoming flow.

Body

Material

Polypropylene

Brass

Stainless

Steel

*Note: Other low flow ranges are available, Please consult the Factory.

9/16 - 18 J514

Port Size

NPT

.25"
.50"
.25"

.50"

.75"

1.0"

1/2" NPT

.75"

1.0"

Part Number

RFO

155421
155481
156261

156262

194761

194762

165071

165075

194763

194764

Flow Range - GPM

Standard

High

0.5 - 5.0 0.1 - 1.0 152147

4.0 - 20.0 1.5 - 12.0 151832

0.5 - 5.0 0.1 - 1.0 152147

4.0 - 20.0 1.5 - 12.0 151832

5.0 - 30.0

8.0 - 60.0

0.5 - 5.0 0.1 - 1.0 152147

4.0 - 20.0 1.5 - 12

5.0 - 30.0

8.0 - 60.0

Range

See Flow Range Chart below.

Low*

Range

N/A

N/A

N/A

N/A

Low Flow

Adapter

Part Number

N/A

N/A

151832

N/A

N/A

WARNING

When determining chemical compatibility of materials of construction, the flow media
and application-associated environmental conditions should be carefully considered

Installation

RotorFlow Sensors connect to piping via NPT mating thread forms. The following guidelines are provided to assist
with installation for a leak-free seal, without damage to the unit.

1) Apply pipe thread sealant to male pipe threads.

2) Thread RotorFlow unit onto male pipe thread until hand-tight.

3) Tighten pipe 1 to 1-1/2 additional turns.

4) If improper seal results, continue turning pipe into unit in 1/4 turn increments.

Do not exceed one additional turn on plastic versions.

Recommended pipe Sealants: (a) Permatex® “No More Leaks” (b) Teflon® Thread Tape.

Specifications

Wetted Materials

Operating Pressure, Max.

Brass/Stainless Steel Body
Polypropylene Body

Operating Temperature, Max.

Electronics (All Bodies)

Viscosity, Max. 200 SSU
Input Power RFO: 4.5 to 24 VDC/12mA RFA: 24 VDC (±10%)/22mA
Output Signal

Body

Rotor Pin
Rotor
Lens
O-Ring

Brass Body 212°F (100°C)

Stainless Steel Body 212°F (100°C)

Polypropylene Body 180°F (82.2°C)

RFO: Frequency Pulses ­Proportional to Flow Rate

Stainless Steel, Brass or Polypropylene

(Hydrolytically Stable, Glass-Reinforced)†

Ceramic

PPS/Teflon Composite; Black

Polysulfone

Buna N or Viton

200 PSIG at 70°F/80 PSIG @ 212°F

100 PSIG at 70°F/40 PSIG @ 212°F

150°F (65.5°C) - Ambient

RFA: 0 - 10 VDC.
Proportional to Flow Rate

Current Source Output, Max. RFO: 70mA (Max) RFA: 10mA (Max)

Frequency Output Range RFO: ~15 Hz to 225 Hz

Electrical Termination Red (+) VDC, Black (-) Ground, White - Signal Output

†

Hydrolytically Stable, glass-reinforced, Polypropylene is

UL-recognized to UL746B at a relative temperature index of 65°C

A RotorFlow Repair Kit is available, including the following replacement parts:
lens, O-ring, shaft, and rotor. Consult Factory to order.